I'm trying to determine global statistics (similar to StatCounter's) for a combination of Browser + OS. For example, 35% (or whatever) of users are on XP and IE8. StatCounter only displays one or the other (ex. 47.32% on XP, 30.20% on IE8).

Is anyone aware of a site that offers this information - preferably free of charge - or a way to glean it from StatCounter or others?

Out of interest, why do you need to know what OS people are using? In terms of websites, the OS they're on is almost meaningless.
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DisgruntledGoatApr 11 '11 at 15:26

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I'm mostly curious to know how many XP users are using a flavor of IE. Given that XP is 47.32% of the internet, and IE9 is only for Vista/Win7, I'm curious to know what percentage of the overall internet population will be using a non-HTML5/CSS3 compliant browser for the foreseeable future. Simply knowing the number of IE8 users doesn't tell me anything as those are spread between XP, Vista and Win7 - some of whom will be upgrading.
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ggutenbergApr 11 '11 at 17:17

who says they won't just upgrade from xp as well though?
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JamesRyanApr 18 '11 at 7:18

Eventually I have no doubt that everyone will upgrade from XP. But I'm making the assumption that anyone using XP and an IE flavour is either a corporate user who has no control over their desktop environment, or a non-technical user who doesn't know any better than using IE. In both of these cases the upgrade path/timeframe to Win7 could be quite far off.
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ggutenbergApr 21 '11 at 6:48

2 Answers
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http://www.statowl.com is the closest thing to a free source of this sort of information, that I've been able to find. For example, here's a chart showing the percentage of Safari users by operating system.

I'm having a little trouble with statowl's interface, but would it be fair to say that statowl.com/… is saying that 50% of IE users are on XP? And statowl.com/web_browser_market_share.php indicates that 61% of internet users are on IE, so effectively 30% of the internet is on both XP and IE? Or is my logic flawed somewhere.
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ggutenbergApr 24 '11 at 12:21

I think your inference is correct (except insofar as StatOwl's figures aren't for the whole internet, just a large but mostly US-based sample set: statowl.com/about_our_data.php). At least, I hope so, because since I found StatOwl, I've been using its figures to make the same sort of calculations. One thing I haven't been able to do from StatOwl's figures is directly infer, for instance, the relative popularity of different versions of IE among that 30%. The closest I can get is to assume the distribution mirrors the distribution for Windows overall: is.gd/JwhwJ9
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sampablokuperApr 24 '11 at 14:36

Ya, I hear what you're saying about versions, but since I'm primarily concerned about IE9+ (or IE8- as the case may be), it comes down to OS. I realize you opened a bounty on this, but your answer is definitely the closest to what I was looking for, so I guess the bounty is yours :)
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ggutenbergApr 24 '11 at 14:42

I was wondering this same thing due to the fact that IE on XP cannot do SNI SSL. Thanks for answering.

To save someone 15 minutes of digging + math on statowl.com, here's what I found
IE users are 50% of browser users
30% of IE users use XP.
Therefore, 15% of the US-based internet is using IE on XP as of Nov 2012